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General Discussion
Effect of power supply(Escom) on sound?
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<blockquote data-quote="chipwelder" data-source="post: 1328" data-attributes="member: 54"><p>A whole house install done by the friendly neighbourhood hi-fi store was seemingly corrupt, switching sources at random... until they noticed that it happened as the fridge switched on and off... so the old grand house's voltage was mostly around 180Volts... but made a large enough dip when fridge switched on to trigger the next set of source selection relays....</p><p></p><p>More seriously though is when you hear equipment switch on through your speakers... click! no not only while the TT is playing... This is usually caused by a low powerfactor... i.e. there is a lot of equipment that does not draw voltage and current in the theoretical way... there's a phase shift between the current and voltage sine waves... not so high quality welders and electrical motors... or if the current sine waves have a clipped peak, which is mostly caused by SMPS's This causes a lot of noise on the line which didn't get filtered by my 80 000 uF, only when I switched to the so-called floating transformer rectification did it get better, lots, now at worst it is audible when very quiet, no music after 10pm in listening position... beforehand it was allways audible, and at worst annoying in low level music passages... </p><p></p><p>So yes ESCOM, but mostly your neighbours do have an influence on the sound... but I must say, I live in a flat in Sunnyside - so perhaps very high density of users... my amps were fairly quiet elsewhere...</p></blockquote><p></p>
[QUOTE="chipwelder, post: 1328, member: 54"] A whole house install done by the friendly neighbourhood hi-fi store was seemingly corrupt, switching sources at random... until they noticed that it happened as the fridge switched on and off... so the old grand house's voltage was mostly around 180Volts... but made a large enough dip when fridge switched on to trigger the next set of source selection relays.... More seriously though is when you hear equipment switch on through your speakers... click! no not only while the TT is playing... This is usually caused by a low powerfactor... i.e. there is a lot of equipment that does not draw voltage and current in the theoretical way... there's a phase shift between the current and voltage sine waves... not so high quality welders and electrical motors... or if the current sine waves have a clipped peak, which is mostly caused by SMPS's This causes a lot of noise on the line which didn't get filtered by my 80 000 uF, only when I switched to the so-called floating transformer rectification did it get better, lots, now at worst it is audible when very quiet, no music after 10pm in listening position... beforehand it was allways audible, and at worst annoying in low level music passages... So yes ESCOM, but mostly your neighbours do have an influence on the sound... but I must say, I live in a flat in Sunnyside - so perhaps very high density of users... my amps were fairly quiet elsewhere... [/QUOTE]
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Audio and Video Talk
General Discussion
Effect of power supply(Escom) on sound?
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